Stellar mass fraction formed in spirals in MW3000HD (top-right panel) and formed stellar mass in the R_gal – Φ-projection for the MW3000HD disc region (6 kpc ≤ R_gal < 20 kpc, top-middle panel) and bar region (R_gal < 6 kpc, top-left panel), corrected for the corresponding pattern rotation, as well as for the disc region of F3000HD, corrected for a pattern speed of Ω = 15.0, 26.0 and 35.0 km s⁻¹ kpc⁻¹ (bottom row). Contour lines indicate 10%, 30%, and 50% of the maximum stellar mass formed (excluding the region of extremely high formed stellar mass at < 0.1 kpc for MW3000HD bar region, upper left). For the MW3000HD disc region, the upper-middle interarm regions are shaded out.